Say's law was the centerpiece of

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Say's law is a fundamental principle of classical economics, which asserts that supply creates its own demand. This means that the production of goods and services generates income, which is then spent in the economy, leading to the purchase of all output. This idea was central to the classical economists' view of how markets worked and was promoted by Jean-Baptiste Say in his writings. Keynesian economics, on the other hand, rejected Say's law and argued that in certain circumstances, there could be an insufficiency of demand in the economy, leading to unemployment and economic stagnation. Communism and rational expectations theory are not directly related to Say's law.

Say's Law Was the Centerpiece of